Europa Flyby - PJ45, September 29, 2022 Options

[Decepticon]

Juno is set to flyby of Europa on Sept. 29, 2022 (PJ45)

I can't wait to see the results of this flyby!


Sadly not much information is available online.


Jason Has a beautiful animation of encounter on youtube.

https://www.youtube.com/watch?v=r9bx1GcoqEE...nel=volcanopele

[Brian Swift]

Has a blue atmosphere on Europa been imaged by Galileo (or any other observation)?
(I'm haven't convinced myself yet, that it is real. But the uniformity across multiple framelets
prevents me from immediately dismissing it as a processing artifact.)


The full resolution PNG for PJ45_01 from which this is cropped is at https://www.missionjuno.swri.edu/junocam/processing?id=13834

[Kevin Gill]

I would attribute that more to chromatic aberration. Europa doesn't have an appreciable atmosphere that I'm aware of.

Has a blue atmosphere on Europa been imaged by Galileo (or any other observation)?
(I'm haven't convinced myself yet, that it is real. But the uniformity across multiple framelets
prevents me from immediately dismissing it as a processing artifact.)


The full resolution PNG for PJ45_01 from which this is cropped is at https://www.missionjuno.swri.edu/junocam/processing?id=13834

[Bill Harris]

I would attribute that more to chromatic aberration. Europa doesn't have an appreciable atmosphere that I'm aware of.

Chromatic aberration? Would a rotating pushbroom be prone to that? We don't see a red-fringe on the opposite night terminator side of the assembled image. Have we seen blue (red) fringes before?

[mcaplinger]

Chromatic aberration? Would a rotating pushbroom be prone to that? We don't see a red-fringe on the opposite night terminator side of the assembled image. Have we seen blue (red) fringes before?

FWIW, Junocam is not a pushbroom. There certainly shouldn't be any significant chromatic aberration, but there are plenty of ways for different color framelets to get misregistered, and that's probably more likely the farther you go from the optic axis.

So I agree with John.

[Bill Harris]

FWIW, Junocam is not a pushbroom. There certainly shouldn't be any significant chromatic aberration, but there are plenty of ways for different color framelets to get misregistered, and that's probably more likely the farther you go from the optic axis.

So I agree with John.

It is indeed a type of pushbroom.
At any rate, it ain't chromatic aberration, which is purely optical.

"In addition to visible light filters, it also has a near infrared filter to help detect clouds; a methane filter in addition the visible color filters. The camera is a 'push-broom' type imager, generating an image as the spacecraft turns moving the sensor in sweeping motion over the observation area.[10]"

[djellison]

At any rate....

You just cited a wikipedia page...which in turn is wrongly using a citation which is a paper on which Mike is a co-author.

https://www.missionjuno.swri.edu/pub/e/down...each_Camera.pdf

No where will you find the phrase pushbroom in that paper.

Because JunoCam - as Mike VERY correctly points out ( as he is - after all - the JunoCam systems engineer ) is NOT a pushbroom camera.

It is a pushFRAME camera which is very different.

It's probably best to trust the paper itself ( and one of its coauthors you were arguing with ) rather than a Wikipedia page editor who wrongly cited it.

[Bill Harris]

You just cited a wikipedia page...which in turn is wrongly using a citation which is a paper on which Mike is a co-author.

https://www.missionjuno.swri.edu/pub/e/down...each_Camera.pdf

No where will you find the phrase pushbroom in that paper.

Because JunoCam - as Mike VERY correctly points out ( as he is - after all - the JunoCam systems engineer ) is NOT a pushbroom camera.

It is a pushFRAME camera which is very different.

It's probably best to trust the paper itself ( and one of its coauthors you were arguing with ) rather than a Wikipedia page editor who wrongly cited it.

I called it a "pushbroom type" of camera, as did Wiki, referring to the general type of sensor on a rotating spacecraft. So, pushbroom, pushframe, whatever. No arguement intended, I learned there were different types of that type of system.
"At any rate", I was questioning whether the blue fringe was chromatic abberation. Correctly, it appears to be misregistration of the color channels.